kingofmonaco Report post Posted June 8, 2019 Will not go over 40 miles per hour has no power changed fuel filter still same problem duramax gulfstream super c Share this post Link to post Share on other sites
f433921 Report post Posted June 8, 2019 I would check the turbo hose to make sure that all clamps are in place and that the hose has no leaks. JIm Share this post Link to post Share on other sites
kaypsmith Report post Posted June 8, 2019 Also check for manifold and exhaust leaks. Share this post Link to post Share on other sites
wildebill308 Report post Posted June 8, 2019 Does it have an exhaust brake? It might not be opening all the way. Bill Share this post Link to post Share on other sites
jleamont Report post Posted June 9, 2019 King, is the engine light on? You will need to have any engine fault codes retrieved from the Engine Control Module. Share this post Link to post Share on other sites
kingofmonaco Report post Posted June 9, 2019 Thanks for all replies will check all suggestions made will keep you posted Share this post Link to post Share on other sites
